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Processes for preparing 4-methyl-5-nonanone and 4-methyl-5-nonanol

a technology of 4methyl-5-nonanone and process, which is applied in the preparation of carbonyl compounds, carboxylic compound preparations, organic chemistry, etc., can solve the problems of difficult industrial production of reactors, and achieve the effects of low cost, high yield and high purity

Active Publication Date: 2020-06-25
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides efficient and economical processes for preparing 4-methyl-5nonanone and 4 methyl-5-nonanol in high purity and yield. The process involves a nucleophilic substitution reaction between 2-methylpentanoic anhydride and an n-butyl nucleophilic reagent, as well as a reduction reaction of 4-methyl-5-nonanone. This invention allows for the preparation of both 4-methyl-5-nonanone and 4-methyl-5-nonanol in shorter steps and at lower costs.

Problems solved by technology

However, in Non-Patent Literature 2, carcinogenic methyl triflate is used as methylating agent and, further, a special aluminum. reagent not easily available as a general reagent is used in an equivalent amount or more.
Moreover, in Non-Patent Literature 2, a reactor equipped with a special cooling device is required for carrying out the reaction at −40° C., but such a reactor is difficult to industrially manufacture.

Method used

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  • Processes for preparing 4-methyl-5-nonanone and 4-methyl-5-nonanol
  • Processes for preparing 4-methyl-5-nonanone and 4-methyl-5-nonanol
  • Processes for preparing 4-methyl-5-nonanone and 4-methyl-5-nonanol

Examples

Experimental program
Comparison scheme
Effect test

example 1

on of 2-methylpentanoic anhydride (1)

[0112]

[0113]First, a distillation tower was corrected to one of the ports of a reactor and a fractionating tower was connected to the outlet of the, distillation tower. Further, a thermometer and a condenser were connected to the fractionating tower.

[0114]The 2-methylpentanoic acid (4) (459.41 g, 3.955 mol) and acetic anhydride (Ac2O) (817.33 g, 7.91 viol) were added to the aforesaid reactor at room temperature. The fractionating tower was then closed and the mixture was stirred at an internal temperature of 160° C. and normal pressure for 30 minutes. Next, the fractionating tower was opened and acetic acid was subjected to distillation at an internal temperature of 160° C. and normal pressure, until an acetic acid content in the distillate containing at least 2.0 acetic acid, acetic anhydride, and acetic 2-methylpentanoic anhydride became 5.0%. Further, the pressure was reduced gradually to 64 mmHg at an internal temperature of 160° C. to distil...

example 2a

n of 4-methyl-5-nonatione (3)

[0116]

[0117]Magnesium (54.42 g, 2.27 gram atoms) and tetrahydrofuran (THF) (639.90 g) were added to a reactor at room temperature and stirred at from 60 to 65° C. for 30 minutes. After the stirring, 1-chlorobutane (197.17 g, 2.13 mol) was added dropwise to the reactor at from 60 to 75° C. and the reaction mixture was stirred at from 75 to 80° C. for 2 hours to prepare butylmagnesium chloride (2: M═Cl).

[0118]Then, tetrahydrofuran (792.26 g) and 2-methylpentanoic anhydride (1) (456.46 g, 2.13 mol) were added to another reactor and the whole amount of the butylmagnesium chloride (2: M═Cl) obtained above was added dropwise at from −5 to 10° C. After the completion of the dropwise addition, the reaction mixture was stirred at from 0 to 10° C. for 3 hours, Then, acetic acid (168.05 g) and water (826.68 g) were added to the reaction mixture in the reactor to cause phase separation and the aqueous phase thus obtained was removed. An aqueous 25 wt % sodium hydrox...

example 2b

f 2-methyl-1-pentanoic Acid (4)

[0120]

[0121]The aqueous phase (2604.29 g) containing sodium 2-methylpentanoate (7: Y═Na) obtained in Example 2A was added to a reactor and an aqueous 20 wt % hydrochloric acid (570.93 g, 3.13 mol of hydrogen chloride) was added dropwise at from 10 to 20° C. After the completion of the dropwise addition, the reaction mixture was stirred at from 15 to 25° C. for one hour. The reaction mixture was left to stand. After 2-methyl-1-pentanoic acid (4) was liberated and the reaction mixture separated into an organic phase and an aqueous phase, the aqueous phase was removed by a phase separation to take up the Organic phase containing the 2-methyl-1-pentatonic acid (4). It was confirmed by a 071 test strip that the aqueous phase had a pH of 1.0. The organic phase thus obtained was concentrated at a reduced. pressure to obtain 2-methyl-1-pentanoic acid (4) (179.19 g, 2.03 mol) in a yield of 95.3%.

[0122]The following is spectrum data of the 2-methyl-1-pentanoic a...

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Abstract

The present invention provides a process for preparing 4-methyl-5-nonanone of the following formula (3): the process comprising at least a step of subjecting 2-methylpentanoic anhydride of the following formula (1) and an n-butyl nucleophilic reagent of the following general formula (2) in which M represents Li, MgZ1, or ZnZ1, wherein Z1 represents a halogen atom or an n-butyl group, to a nucleophilic substitution. reaction Coproduce 4-methyl-5-nonanone (3), as well as a process for preparing 4-methyl-5-nonanol of the following formula (5), the process comprising at least steps of preparing 4-methyl-5-nonanone; and subjecting the obtained 4-methyl-5-nonanone and a reducing agent to a reduction reaction to produce 4-methyl-5-nonanol (5).

Description

TECHNICAL FIELD[0001]The present invention relates to processes for preparing 4-methyl-5-nonanone and 4-methyl-5-nonanol which are known as an aggregation pheromone of red palm weevil (scientific name; Rhynchophorus ferrugineus e.g. Rhynchophorus ferrugineus Olivier) which is pest of palm trees.BACKGROUND ART[0002]The red palm weevil is a key pest of plants of the family Pamae such as date palm, coconut, oil palm, and betel palm. Adults of the red palm weevil enter the trunk of a palm tree and lay eggs therein. Meanwhile, their larvae eat the inside of the tree, whereby weakening and eventually killing the plant. The red palm weevil is a species native in South Asia and Melanesia. It has spread to Southeast Asia, Middle East, North Africa, Europe, the United States of America, and others and is now causing a serious damage to patinae plants over wide areas. Adults and larvae of the red palm weevil move into a palm tree, so that they cannot easily be controlled by an insecticide. Mas...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07C29/143C07C45/67
CPCC07C45/676C07C51/56C07C29/143C07C51/487C07C49/04C07C53/126C07C31/125C07C45/00C07B2200/07C07C53/128C07C45/455
Inventor MIYAKE, YUKIKINSHO, TAKESHINAGAE, YUSUKE
Owner SHIN ETSU CHEM IND CO LTD
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